Most businesses start looking for a virtual phone number service with one practical goal: give customers in a market a number they can call locally, and have those calls reach the team wherever it works. The number itself is quick to buy, which is why providers look interchangeable at first glance. The differences show up later, in who registers the number, how calls travel to your phones, how fast routing can change and what happens when you want to leave. Numbers people use to receive SMS verification codes are a separate consumer product and are not what this guide covers.

If you are new to the concept, our guide on what a virtual phone number is explains the basics: a number that is not tied to one physical line, so calls can ring wherever you choose. This article is about choosing the service behind it, based on how CallFactory has run business numbers since 2000. To see which countries and number types are available, start with the phone numbers overview.

What a virtual phone number service actually includes

A business number is a bundle of several services, and a provider can be strong on one part and weak on another. The first part is the number: its country, its type and whether it is registered correctly with the national regulator. The second is routing, meaning the rules that decide where a call rings, at what time and what happens when nobody answers. The third is the network path that carries the call from the caller to your team, which is the part customers hear. The fourth is control, because you need to change destinations, opening hours and menus yourself without opening a ticket.

The last parts are easy to overlook until they matter. Porting decides whether you can bring an existing number in and take it out again later. Support decides how quickly a routing problem is fixed on a day when a campaign is running. When you compare providers, ask about each of these parts separately instead of comparing a monthly price for “a number”, because that price rarely tells you what is included.

Number types and countries: match the number to the market

Every country has its own mix of number types, and choosing the right one shapes how customers read your business. A geographic number carries a city or regional area code, which suits a company that wants to look established in one city. A national number has no link to a city and works across the whole country, while a toll-free number lets customers call without paying for the call, which suits support lines and campaigns. Callers dial all of them at domestic rates or for free, so they never have to place an international call to reach you.

Check that a provider offers the specific type you need in each market rather than a generic “local number”. CallFactory supplies numbers in more than 40 countries across Europe, the Americas and Asia-Pacific, and each country page shows which types are available there. If you are opening several markets at once, our guide to getting an international phone number explains how to plan numbers across borders.

Registration and verification differ per country

A number is a public resource that belongs to the national numbering plan, so every regulator decides who may hold which type. Some countries let you register on your own company address anywhere in the world, while others require an establishment or an address inside the number’s zone. In the UK, any number registers on your company address in any country without a UK establishment. In Germany, geographic numbers and 032 national numbers need a German address, while 0800 toll-free numbers can be registered on a worldwide address. In France, every number requires a French establishment with a Kbis extract and a SIRET number.

A provider that skips these checks is not doing you a favor, because a number registered without the required documents can be withdrawn later, after you have printed it on every quote and ad. Ask which documents each country needs before you order, and expect the provider to tell you when a number type is not open to your company. Our overview of European local-number registration rules goes through the main markets, and requirements for other countries are listed on each country page.

Where calls ring and how they get there

Routing is where a virtual number earns its keep. With call forwarding you decide where each call is delivered: a mobile, a landline at the office, a remote employee, a branch in another country, your own or an external call center, or a voicebot that answers every caller straight away. Rules by time of day send after-hours calls to whoever is on duty, and a call queue holds callers in line during busy moments instead of sending them to voicemail.

The network path matters as much as the destination. CallFactory routes calls over premium fixed networks rather than the cheapest internet path available at the moment of the call, so a customer calling your local number hears a stable domestic connection even when your team sits in another country. You can also receive calls over VoIP when that suits your setup, and the choice of route stays with you. Our article on choosing a premium European local-number provider explains the difference between the two paths in more detail.

Who runs the platform behind your number

Behind every virtual number sits a platform that answers the call, applies your routing and connects it to your team. Some providers rent that layer from a third party, which works until you need an urgent routing change or a fault fixed, because they can only pass the request up the chain and wait for an answer.

CallFactory is a licensed telecom provider in 15 countries and operates its own intelligent IVR platform. The team that activates your number also builds your menus and voicebots, changes your routing and resolves faults, which shortens the time from question to fix. Before signing up with any provider, ask who operates the platform your calls run through and who you speak to when something has to change the same day.

How to get a virtual phone number for your business

Getting a virtual phone number takes four steps, and most of the work sits in the first two. Start by choosing the country and number type that match how your customers will call you: a geographic number for one city, a national number for the whole country or a toll-free number for a support line. Then check the registration requirements for that type and have the documents ready, such as your company details and, where the country asks for it, proof of address.

Once those are settled, you pick a number on the country page and decide where calls should ring, for example on the mobiles of your sales team during office hours and on a colleague in another time zone after hours. Most numbers are active within one business day after the order, and you can change every routing rule yourself from that moment on. If customers already know an existing number, port it instead of starting over, so the number on your website and your quotes stays the same.

A checklist before you sign up

Before choosing a virtual phone number service, run each provider through the same short list of questions. The answers usually narrow the field quickly, because vague replies on registration or routing tend to predict vague support later on.

  • Does the provider offer the exact number type you need in each country, and which registration documents does each one require?
  • Who operates the platform that routes your calls, and can that team change your routing and menus directly?
  • How are calls carried: over fixed networks, over the cheapest internet path, or both at your choice?
  • Can you change destinations, opening hours and menus yourself, and do changes take effect immediately?
  • Can you port an existing number in, and take it out again, without losing it?
  • Can you test a real number on your own phones before you commit, for example with a demo number?

When you have your shortlist, compare what is included on the pricing page rather than the headline price alone. If you already have a number that customers know, check the number porting process first, and then choose a country on the phone numbers overview to see which numbers are available for your business.